Answer:
Primary active transport directly uses a source of chemical energy (e.g., ATP) to move molecules across a membrane against their gradient.
Enzymes are biological molecules (typically proteins) that significantly speed up the rate of virtually all of the chemical reactions that take place within cells. They are vital for life and serve a wide range of important functions in the body, such as aiding in digestion and metabolism.
Peptide hormones are usually produced in the body ahead of the time when they will be required. They are usually synthesized in the inactive form and store in the secretory vesicles just under the plasma membrane. Stimulation of the signalling causes immediate release of these hormones into the surrounding medium or the blood. Thus, cellular response to a peptide hormone is always rapid compared to that of the steroid hormone.
When the lateral hypothalamus is destroyed, animals will stop eating and should fed forcefully. The hypothalamus contains two portions that would function to control eating and hunger. It is the Ventromedial Nuclei that is responsible for signalling when to stop eating while the lateral hypothalamus signals when to start eating. When this part is damaged, it is clear that the body could not feel or know when to eat. This part of the hypothalamus consists of primary orexinergic nucleus that is projected over the nervous system. These neurons aids in a number of physical and cognitive processes like feeding behavior.
A. lipids are a type of fat. Definition of lipid: <span>any of a class of organic compounds that are fatty acids or their derivatives and are insoluble in water but soluble in organic solvents. They include many natural oils, waxes, and steroids. The definition is from google.</span>
